DENVER—Fox News reporter Jana Winter has asked the judge in the Colorado theater shootings to postpone a September hearing on a story she wrote about suspect James Holmes until a court in her home state of New York can hear her request to reject a Colorado subpoena.

Winter’s request, filed Thursday, was made public Monday.

The Colorado court issued a subpoena seeking the identity of Winter’s confidential law-enforcement sources for a story that said suspect James Holmes sent violent drawings to a psychiatrist.

The subpoena could force Winter to reveal the names of her sources or go to jail. Winter is resisting, citing New York and Colorado reporter shield laws and an ethical obligation to protect her sources’ identities.

Holmes’ attorneys said Winter’s sources violated a gag order. They also said officials who denied being Winter’s source might have lied, undermining their credibility as trial witnesses.

The Colorado judge has not said yet whether Winter would have to testify, but Winter has been ordered to return to the state for a hearing on Sept. 30.

Colorado needs New York’s approval to enforce the subpoena. Two New York courts have ruled the subpoena is valid, but Winter has appealed to the state’s highest court.

Holmes is accused of killing 12 people and injuring 70 in a suburban Denver theater in July 2012. He pleaded not guilty to charges of murder and attempted murder.

Prosecutors are seeking the death penalty.

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